Anthropic's pre-IPO shares fall as US government shuts down its most powerful AI model

Markets Anthropic's pre-IPO shares fall as US government shuts down its most powerful AI model A jailbreak report prompted Washington to pull Fable 5 and Mythos 5 from all users. Anthropic complied but pushed back hard, saying the finding sets a standard that would halt the entire AI industry. By Shaurya Malwa Jun 13, 2026, 6:02 a.m. 2 min read Make preferred on Share Share this article Copy link X icon X (Twitter) LinkedIn Facebook Email Make preferred on Summary Show The U.S. government ordered Anthropic to shut down access to its two most advanced AI models, Fable 5 and Mythos 5, citing national security concerns over a potential jailbreak. Anthropic has challenged the directive, arguing that the government has only provided verbal evidence of a narrow, previously known vulnerability that similar models, including OpenAI’s GPT-5.5, can also identify. Traders reacted negatively to the shutdown, with the Anthropic perpetual contract on Hyperliquid falling about 3.7 percent and raising new questions about the company’s pre-IPO valuation and listing prospects. The US government ordered Anthropic to shut down its two most capable AI models on Friday, and the pre-IPO market for Anthropic shares sold off immediately. The Anthropic perpetual on Hyperliquid, a cash-settled contract that tracks where traders expect the company's equity to price, dropped 3.7% on Saturday to about $1,627, data shows . The contract had been trading near all-time highs above $1,800 in the days after Fable 5 launched. Open interest on the contract sits near $8.6 million, small relative to the SpaceX perp but meaningful for a company that has not yet filed for an IPO. Anthropic said it received the directive from the US government at 5:21 p.m. ET on Friday. The order, citing national security authorities, required the company to suspend all access to Fable 5 and Mythos 5 for any foreign national, inside or outside the United States. It then executed a full shutdown for all customers. The government told Anthropic it had become aware of a method to bypass, or jailbreak, Fable 5. Anthropic reviewed the technique and said what it saw was narrow, not a universal jailbreak, and involved identifying a small number of previously known, minor vulnerabilities. It said other publicly available models, including OpenAI's GPT-5.5, can find the same vulnerabilities without any bypass at all. The company said the government has so far provided only verbal evidence of a potential narrow jailbreak, which it described as essentially asking the model to read a codebase and fix software flaws, a task defenders use every day. It said applying this standard across the industry "would essentially halt all new model deployments for all frontier model providers." Anthropic built its entire brand around safety-first AI development, and it is now publicly disputing a national security directive on the grounds that the government's evidence does not clear its own stated bar. The company will share more details about the specific jailbreak within 24 hours. The crypto market is now pricing the shutdown as a negative for the IPO case, and the Anthropic perp's drop from its post-launch highs reflects that. The first question for the company's public listing ambitions is whether the government's order gets reversed, narrowed, or extended to other model classes once Anthropic publishes its technical rebuttal. 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